A lead-acid battery in which the plates are fabricated from a paste containing principally lead oxide and a small amount of dimensionally isotropic graphite fiber of a specific type. The specific type of graphite fiber may be either a graphite fiber synthesized from a polyacrylonitrile (PAN) precursor...http://www.google.co.uk/patents/US5223352?utm_source=gb-gplus-sharePatent US5223352 - Lead-acid battery with dimensionally isotropic graphite additive in active material
